Mince the garlic and parsley finely.
In a medium saucepan, melt the butter over medium heat. Add the minced garlic and sauté for 1-2 minutes, or until fragrant.
Sprinkle in the flour and whisk continuously until you have a smooth roux.
Pour in the beer, whisking constantly to prevent lumps from forming. Bring to a simmer and cook for 2-3 minutes.
Stir in the heavy cream and Dijon mustard until well combined.
Season with salt and freshly ground black pepper to taste. Simmer for another 5-7 minutes, or until the sauce has thickened to your liking.
Garnish with fresh parsley and serve warm over grilled meats or vegetables.
Leftovers can be stored in an airtight container in the refrigerator for up to 3 days.
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